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Cascadia Subduction Zone

All articles tagged with #cascadia subduction zone

science1 month ago•6 min saved

Hidden fault puzzle revealed by whisper-quiet quakes off Northern California

Scientists using a dense seismometer network tracked ultra-small, low-frequency earthquakes offshore to map a five-piece fault system where the San Andreas fault meets the Cascadia subduction zone, including a deep Pioneer fragment from the Farallon plate, which helps explain the unusually shallow 1992 quake and challenges prior boundary models; the work, published in Science, improves understanding of seismic hazards in this complex region.

via ScienceDaily|

#cascadia-subduction-zone #earthquakes #mendocino-triple-junction

science1 month ago•7 min saved

Tiny Quakes Reveal a Hidden Five-Piece Subduction Puzzle Under Northern California

Scientists using a dense array of seismometers tracked tiny, often imperceptible earthquakes to map five moving tectonic pieces beneath Northern California, including hidden fragments of the North American and Pioneer/Farallon blocks. The study refines the subduction-zone model around the Mendocino Triple Junction, explains a shallower-than-expected 1992 earthquake, and has implications for seismic hazard assessment along the Cascadia and San Andreas regions.

via SciTechDaily|

#cascadia-subduction-zone #low-frequency-earthquakes #mendocino-triple-junction

planet-earth1 month ago•55 min saved

Hidden plate fragment shifts quake risk at Mendocino junction

A long-lost oceanic plate fragment called the Pioneer Fragment is now stuck to the Pacific Plate at the Mendocino triple junction, moving northwest under North America and interacting with the Gorda Plate, increasing contact with the Cascadia subduction zone and potentially adding a previously unmodeled fault to regional earthquake risk models.

via Live Science|

#cascadia-subduction-zone #earthquake-risk #mendocino-triple-junction

science3 months ago•4 min saved

Earth's Crust Splitting Off Pacific Coast in Real-Time Tectonic Shift

Scientists have mapped a deep tear forming beneath the seafloor off Vancouver Island in the Nootka Fault Zone, indicating a potential end to subduction in that region, which could alter seismic activity and the geological landscape of the Cascadia margin.

via Earth.com|

#cascadia-subduction-zone #earths-crust #fault-zone

science3 months ago•3 min saved

Pacific Ocean Crust Splitting Sparks Tectonic Shift and Seismic Concerns

Scientists have discovered that a section of the oceanic crust beneath Vancouver Island is gradually breaking apart, providing direct evidence that subduction zones can disintegrate progressively rather than collapsing suddenly, which may influence future seismic risk assessments and our understanding of Earth's geological processes.

via The Daily Galaxy|

#cascadia-subduction-zone #earthquake-risk #oceanic-crust

science4 months ago•3 min saved

Discovery of a Hole in the Ocean Floor

A spring called Pythia’s Oasis has been discovered off the Pacific Northwest coast, leaking water from beneath the seafloor through the Cascadia Subduction Zone, which could influence earthquake risk by acting as a lubricant between tectonic plates. Monitoring this leak is crucial for understanding and preparing for potential large earthquakes in the region.

via Yahoo News Canada|

#cascadia-subduction-zone #earthquake #ocean

science4 months ago•6 min saved

Pacific Northwest Earth's Crust Fracturing

Scientists have captured detailed seismic images revealing that the Cascadia subduction zone off Vancouver Island is gradually breaking apart in a step-by-step process, creating microplates and shedding light on how subduction zones end, which has implications for earthquake hazards in the Pacific Northwest.

via SciTechDaily|

#cascadia-subduction-zone #earthquake-risk #microplates

science6 months ago•4 min saved

1954 Northern California Quake Originated from Silent Cascadia Subduction Zone

A 1954 magnitude 6.5 earthquake in Northern California was likely caused by the Cascadia Subduction Zone, which is usually quiet but may rupture in segments, as suggested by new research analyzing old seismic records, helping to better understand regional earthquake hazards.

via Live Science|

#1954-quake #cascadia-subduction-zone #earthquake

science1 year ago•3 min saved

"Tsunami Sands Enhance Accuracy of Cascadia Earthquake Models"

Scientists have used sediment cores and the Delft3D-FLOW model to test various earthquake models of the 1700 Cascadia event, finding that the earthquake likely caused at least 0.8 meters of subsidence and about 12 meters of fault slip. This study provides new constraints on the earthquake's size and offers insights into using tsunami deposit mapping and sediment transport models to better understand past and future seismic events.

via Phys.org|

#1700-earthquake #cascadia-subduction-zone #earthquake-modeling

natural-disasters2 years ago•23 min saved

"FEMA's Oversight: Neglecting Northwest's Tsunami Risk Analysis"

The National Risk Index (NRI), a federal tool used to assess disaster risks and allocate funding, is failing to accurately account for the tsunami threat along the Cascadia Subduction Zone in the Pacific Northwest. The NRI assigns low or moderate tsunami risk ratings to areas that are projected to be severely impacted by tsunamis, putting vulnerable communities at risk. The index's flawed designations and data gaps have raised concerns among emergency managers and planners who rely on accurate risk assessments to prioritize disaster preparation and mitigation efforts. The discrepancies in the NRI's ratings highlight the need for improved tools and localized risk assessments to protect communities from the devastating impact of natural disasters.

via POLITICO|

#cascadia-subduction-zone #emergency-management #fema

science2 years ago•1 min saved

Uncovering the Cascadia Fault's Potential for Deadly Quakes.

Scientists have discovered warm liquid bubbling up from the seafloor about 50 miles off the Oregon coast, providing insight into the Cascadia Subduction Zone, a fault line known for producing massive quakes every several hundred years. The discovery gives scientists a better idea of how tectonic plates lock into place between large earthquakes and could improve earthquake forecasting down the line. The last major quake to strike the fault was on Jan. 27, 1700, and scientists determined entire forests died across hundreds of miles when the coasts of what are today Washington, Oregon and northern California suddenly dropped 4–6 feet, flooding the coastline with seawater amid an incredible tsunami.

via Yahoo News|

#cascadia-subduction-zone #earthquake #science

science2 years ago•2 min saved

Uncovering the Cascadia Fault's Potential for Deadly Quakes.

Scientists have discovered warm liquid bubbling up from the seafloor about 50 miles off the Oregon coast, providing insight into the Cascadia Subduction Zone, a fault line known for producing massive quakes every several hundred years. The discovery gives scientists a better idea of how tectonic plates lock into place between large earthquakes and could improve earthquake forecasting down the line. While the discovery doesn't forebode an imminent quake, experts warn that the Pacific Coast could experience similar destructive impacts as the 9.0 quake that struck off the coast of Japan in 2011.

via Fox Weather |

#cascadia-subduction-zone #earthquake #science

science2 years ago•1 min saved

Mysterious Ocean Floor Leak off Oregon Raises Concerns for 'The Big One'

A warm liquid leak, called Pythia's Oasis, has been discovered by researchers from the University of Washington off the coast of Oregon in the Cascadia Subduction Zone, an area known for earthquakes and tsunamis. The fluid released from the fault zone is like a leaking lubricant, which could increase the chance of a damaging quake. However, the discovery could give researchers more insight into this unstable region.

via Central Oregon Daily|

#cascadia-subduction-zone #earthquakes #oregon

science2 years ago•2 min saved

"Seabed Leaks Pose Threat of Devastating Earthquake on Pacific Coast"

University of Washington scientists have discovered that the Cascadia Subduction Zone, which runs along the Pacific coast from California to British Columbia, is leaking fluid, which is bad news for earthquake hazards. The fault is a 600-mile fault that is about 70-100 miles off the Pacific coast shoreline. It's been 232 years since the last large quake along the fault, and scientists say we're overdue. There is about a 37 percent chance that a megathrust earthquake of 7.1+ magnitude in this fault zone will occur in the next 50 years.

via OregonLive|

#cascadia-subduction-zone #earthquake #pacific-northwest

science2 years ago•2 min saved

Deep Sea Leak Sparks Disaster Concerns Among Scientists

Scientists have discovered a leak in the ocean, named Pythia's Oasis, on top of the Cascadia Subduction Zone fault in the Pacific Northwest. The liquid spewing up from the leak could be a type of tectonic lubricant, and its loss could lead to friction between the oceanic and continental tectonic plates, causing them to lock and resulting in earthquakes. The Cascadia Subduction Zone is known for one of the largest earthquakes the world has ever experienced, making scientists concerned about the leak and what it might mean for the megathrust found in this area.

via Yahoo Entertainment|

#cascadia-subduction-zone #earthquakes #ocean